JP2001241053A - Method for constructing underground structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that bolts are required while connecting treatment by a welding means must be conducted for constructing an underground structure because the connecting sections of both side edges of each panel and each column are coupled by the bolts or the welding means. SOLUTION: In the method for constructing the underground structure in which the columns 50, 60 made of concrete are buried vertically at each corner section of the underground structure to be constructed and fixed intermediate places among each corner section, panels 80 made of concrete are dropped up to fixed depth by excavating and removing soil in the lower sections of the panels among the mutually adjacent columns and the four sides of a basement are surrounded, a panel building and main-body excavating process, in which the lower sections of the panels 80 are excavated, hanging the panels 80 among the columns 59, 60 and the panels 80 are dropped in, and a tie-beam driving process in which reinforcing tie beams 95 for preventing pushing-out to the insides by earth pressure of a wall are installed to each column 50, 60 and the upper sections of the walls on the four sides are contained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground structure, and more particularly, to a method for constructing an underground structure to be constructed between adjacent corners and between adjacent pillars which are vertically embedded at predetermined intermediate positions between the corners. The present invention relates to a method for constructing an underground structure in which a concrete panel is lowered by excavating and removing soil below the panel so as to surround all sides with panels.

[0002]

2. Description of the Related Art As a method of constructing an underground structure, concrete pillars are vertically buried at each corner of the underground structure to be constructed and at predetermined intermediate positions between the corners, and concrete pillars are placed between adjacent pillars. The lower panel is lowered to a predetermined depth by excavating and removing the soil below the panel, and the both side edges of each panel and each column are connected with each other at a joint part, and the floorboard is cast with concrete. In the structure construction method, an underground structure construction method is known in which the joints between the side edges of each panel and each pillar are connected by a connecting means such as a bolt (Japanese Patent No. 2828954).

[0003]

According to the method for constructing an underground structure disclosed in Japanese Patent No. 2828954, the joint between the side edges of each panel and each column is connected by bolts or welding means, so that the underground structure is constructed. However, there is a problem that the connection processing must be performed.

[0004]

According to a first aspect of the present invention, a concrete pillar is vertically buried at each corner of a subterranean structure to be constructed and at a predetermined intermediate position between the corners. In the method of constructing an underground structure surrounding four sides of a basement by lowering a concrete panel in between to a predetermined depth by excavating and removing the soil below the panel, and burying the column The position of a cloth moat for installing a guide for performing the cloth moat digging the cloth moat, drilling the pillar deeper than a predetermined depth at which the panel descends at the position where the pillar of the cloth moat is to be built A pillar installation / drilling process, a guide installation process for assembling and installing a guide composed of an outer frame and an inner frame having a guide portion for embedding the column, and a column on the cloth moat along the guide. And put concrete in the deep part Piling and fixing the pillars to fix the pillars, removing the outer frame of the guide, removing the outer frame of the guide, excavating the lower part of the panel while hanging the panel between the pillars, and dropping the panel Panel construction / body excavation process, reinforcement beam to prevent the above wall from protruding inward due to earth pressure, installation process at the top of each pillar and four side walls, concrete construction of the connection beam After that, a guide inner frame removing step of removing the guide inner frame is included.

According to a second aspect of the present invention, a concrete pillar is vertically embedded at each corner of the underground structure to be constructed and at a predetermined intermediate position between the corners, and a concrete panel is provided between adjacent pillars. In the underground structure construction method surrounding the four sides of the basement by lowering to a predetermined depth by excavating and removing the soil below the panel, a position for installing the column and a guide for burying the column are installed. A digging process for digging the digging, a digging process for digging the digging process, and a column digging process for digging the column at a position where the column for the digging process is to be built deeper than a predetermined depth at which the panel descends. Process, having a guide portion for burying the pillars, assembling a guide composed of an outer frame and an inner frame, and installing a guide to install the pillars; Pour concrete into part Pillar fixing / fixing process to fix, Guide outer frame removing process to remove outer frame of guide, Panel erection / body excavating process to excavate lower part of panel while hanging panel between the above columns and drop panel, Bottom slab casting process to install a bottom slab at the lower part of the part surrounded by the dropped wall, reinforcing tie beams to prevent the above wall from protruding inward due to earth pressure are installed at the top of each pillar and four side walls The method further includes a step of placing a connecting beam and a step of removing a guide inner frame after the concrete of the connecting beam is solidified.

According to a third aspect of the present invention, a concrete pillar is vertically buried at each corner of the underground structure to be constructed and at a predetermined intermediate position between the corners, and a concrete panel is provided between adjacent pillars. In the underground structure construction method surrounding the four sides of the basement by lowering to a predetermined depth by excavating and removing the soil below the panel, a position for installing the column and a guide for burying the column are installed. A digging process for digging the digging, a digging process for digging the digging process, and a column digging process for digging the column at a position where the column for the digging process is to be built deeper than a predetermined depth at which the panel descends. Process, having a guide portion for burying the pillars, assembling a guide composed of an outer frame and an inner frame, and installing a guide to install the pillars; Pour concrete into part Pillar fixing / fixing process to fix, Guide outer frame removing process to remove outer frame of guide, Panel erection / body excavating process to excavate lower part of panel while hanging panel between the above columns and drop panel, Filling the space between the panel and the column with a waterproofing agent, installing a formwork inside the space between the side end surfaces of both panels adjacent to each other, and filling the mortar in this space. , A reinforcing beam to prevent the above wall from protruding inward due to earth pressure, a connecting beam setting process to install on each column and the upper part of the four side walls, after the concrete of the connecting beam is solidified, the inner frame of the guide And a step of removing the guide inner frame.

[0007] The invention of claim 4 is the invention of claim 1, 2, or 3.
The described underground structure construction method is a method of constructing an underground structure for installing a two-stage, liftable underground mechanical parking lot.

[0008]

According to the present invention, concrete pillars are vertically buried at each corner of the underground structure to be constructed and at predetermined intermediate positions between the corners, and concrete pillars are placed between adjacent pillars. In the method of constructing an underground structure surrounding four sides of a basement by lowering the panel to a predetermined depth by excavating and removing the soil below the panel, a frame-type reinforcing tether is provided on the upper four sides of the dropped wall. Is provided, it is possible to prevent the wall from protruding inward due to earth pressure without connecting each panel and each column with connecting means such as bolts.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows each step of the method for constructing an underground structure. (1) Preparatory process 1 Prior to the construction method for underground structures, a vacant lot for construction equipment such as heavy machinery and construction materials Secure. In addition, the position where the pillar is to be installed is confirmed, and a digging line for a digging process for digging a digging for installing a guide for burying the pillar is determined. (2) Cloth digging process 2 As shown in FIG. 2 along the excavation line of the construction site, the depth is 1.0 m, and the width is a guide R described later (FIG. 11).
The back hoe B is used to make the cloth moat N to a width where the reference fabric can be installed. Nunobori N refers to a moat formed in a planned site where an underground structure is to be constructed in order to install a guide R in a planned site where an underground structure is to be constructed. (3) Pillar Building / Drilling Step 3 As shown in FIG. 3, the drilling position where the pillar of the cloth moat N is to be built is accurately measured, and the hole 13 where the pillar is to be built by the auger drilling machine G is located at this drilling position. Drill holes. The size of the hole 13 is slightly larger than the outer shape of the pillar, and the depth is, as shown in FIG. 7, a panel 80 (see FIG. 27) to be described later positioned at the bottom of the underground structure (in FIG. 7, a broken line). ), The panel 80 is dug deeper by the length of the panel 80 in the building direction. In the pillar building / drilling step 3, when drilling in a ground where the hole wall at the time of drilling collapses, the drilling is performed using a casing so that the wall of the drilling does not collapse. (4) Guide Installation Step 4 As shown in FIG. 4, prior to installation of the guide R, the base surface of the portion where the guide R is installed is adjusted so as not to hinder the installation of the guide R, Thereafter, the guide R is accurately set at a predetermined position.

As shown in FIGS. 11 to 16, the guide R is slightly larger than the size of the land on which the underground structure is to be constructed, and is an outer frame in which four H steels 11a, 12a, 13a, and 14a are combined with each other. 11A, an intermediate frame 50 and a corner column 60 (see FIGS. 19 and 24)
4) H steels 11b and 12 separated inside by the thickness of
b, 13b, and 14b are combined with an inner frame 11B, and an upper guide 11G,
Similar to G, steel materials 11ag, 12ag, 13ag, 14a
g, 11bg, 12bg, 13bg, 14bg (12a
g, 13ag, 11bg, 12bg, and 13bg are not shown) and a lower guide 11g combined with each other with a certain gap between both guides, and a U-shaped steel material 21,
22, 23, 24, 25, 26, 27, 28, 29, 3
0, 31, 32, 33, 34, 35, 36, 37, 3
It consists of an upper and lower double structure connected by 8, 39 and 40.

The connection state of the guide R will be described with reference to the connection state at one corner portion shown in FIGS. 13 and 15 among the four corners, and the description of the other corner portions will be omitted. 13 and 15, the upper guide 11
At the corners of G, the outer frame H steel 11a, H steel 1
4a and the U-shaped steel members 21 and 40 are respectively bolted 41a and 42a and nuts 41b and 42b,
H steels 11b and 14b of the inner frame and steel members 21 and 4
0 is the other bolt 43a, 44a and nut 4 respectively.
3b and 44b. Since the upper guide 11G and the lower guide 11g have the same combined configuration, the same reference numerals as those in the above-described connected state are given and the description thereof is omitted.

The connection state of the upper guide 11g at a predetermined intermediate portion between the corner portions of the guide R will be described with reference to FIGS. The description of the connection state of the intermediate portion is omitted. FIG.
In 3 and 16, the H steel 11a of the outer frame and the U-shaped steel materials 22 and 23 are respectively bolted 45a and 46a and the nuts 45b and 46b, and the H steel 11b of the inner frame and
The U-shaped steel members 22 and 23 correspond to the other bolts 4 respectively.
7a, 48a and nuts 47b, 48b are connected to each other. The upper guide 11G and the lower guide 11g are
Since the configurations are the same, the same reference numerals are given to the above-described connected states, and the description thereof is omitted.

As described above, when the outer frame 11A and the inner frame 11B are connected and combined, corner pillars RA, RB, RC, and RD on the four sides of the guide R are provided with corner posts 60 to be described later.
The guide holes RW (see FIGS. 13 and 15) into which the holes are to be built and the portions RE, RF,
The RG, RH, RI, and RJ are provided with guide holes RY (see FIGS. 13 and 16) into which the later-described intermediate columns 50 are to be built. 15 and 16, bolts and nuts are indicated by phantom lines. As shown in FIGS. 13 and 15, inside the guide hole RW of the corner portion 11 </ b> A of the guide R, L-section steels RK, RL, RM, and RN for filling and guiding the gap with the corner column 60 are provided. Provided. The L-shaped steel sections RK, RL, RM, and RN are welded to the guide R. Further, inside the guide hole RY of the intermediate part C, a steel material RQ having a U-shaped cross section for filling and guiding the gap with the intermediate column 50 is provided. The U-shaped steel material RQ is fixed to the guide R with bolts. (5) Pillar Building / Consolidation Step 5 As shown in FIG. 5, the guide holes RW and RY of the guide are provided.
Along with (see FIG. 13), a corner pillar 60 (see FIG. 14) is inserted into the hole 13 by a crane of a tow truck K.
And the intermediate pillars 50 are respectively erected, the distance between the pillars is accurately measured, and concrete is poured into the hole 13 from the position shown by the broken line in FIG.
0. The corner post 60 is fixed in the hole 13. The poured concrete is cast with a short hose so that the aggregate does not separate. Guide R is a corner post 60
And when the intermediate pillar 50 is erected, it is provided in order to regulate further accuracy of the erected position.

As shown in FIGS. 17 to 20, the intermediate pillar 50 has a substantially rectangular pillar shape in cross section, and has a trapezoidal projection in the center of the inside in the longitudinal direction of the pillar. A mating member mounting surface 51 is formed. The intermediate column 50 is a concrete column in which a reinforcing bar 58 knitted in combination of a quadrangular shape and a chevron shape is disposed as an aggregate, and an eyebolt IB for lifting a crane is attached to and detached from the top. A plurality of insert members IS having a bifurcated lower portion are embedded therein, which can be freely screwed, and eyebolts IB are screwed into the insert members IS.

On the mating member mounting surface 51, a plurality of plate-shaped mating members 54 each having a vertically long quadrilateral having engaging portions 54a, 54a formed on both sides are fixed by bolts 56. The bolt 56 is fixed to the inside of the pillar by detachably screwing it into an insert member IS embedded therein. Hereinafter, when the bolt is a bolt that is screwed into an insert member embedded inside the pillar, it is simply referred to as a bolt with an insert member. Fitting member mounting surface 51
On both sides of the column, grooves M, which fill the sealing material in the longitudinal direction of the pillar,
M is provided.

As shown in FIGS. 21 to 25, the corner post 60 has an L-shaped cross section in which two adjacent sides of a square post are cut off in the vertical direction of the post. On the two intersecting surfaces, mating member attachment surfaces 62, 62 forming a step are formed. On the mating member attachment surfaces 62, 62, a plurality of mating members 70 each having an X-shaped columnar cross section are provided in the longitudinal direction of the column.
1, 72 are fixed by bolts 65 with insert members. The joining member 70 has its X-shaped both feet 71, 72.
Are welded at the center of the joints 73 and 74. The corner pillar 60 has an L-shaped braided reinforcing bar 6 inside.
7, a concrete pillar arranged as a base material, and a plurality of insert members IS having a bifurcated lower portion into which a crane lifting eyebolt IB can be detachably embedded are embedded at the top. The eyebolt IB is screwed to the insert member IS. (6) Guide outer frame removing step 6 After the concrete poured in the solidification step is solidified as shown in FIG. 6 and the columns 50 are fixed in the drilled holes, the panel 80 (see FIG. 7) is inserted between the columns. The outer frame 11A of the guide and the U-shaped steel members 21, 22, 23,
24, 25, 26, 27, 28, 29, 30, 31, 3
2, 33, 34, 35, 36, 37, 38, 39, 40
Are removed from the cloth moat N by removing the bolts 43a, 44a, 47a, 48a (see FIG. 11). The guide inner frame 11B is left at a position where the guide inner frame 11B is assembled for use as a support. (7) Panel Construction / Main Body Excavation Step 7 As shown in FIG. 7, a panel 80 to be described later is hung by a crane of a tow truck K, and mating members 54 and 70 of the columns are provided.
And the panel joining members 81 and 82 (FIG. 29,
31), the panel is built. The body part surrounded by the built-in panel is excavated by the backhoe B, and the lower part of the panel 80 is excavated and dropped by hanging the panel 80 by human power.

As shown in FIGS. 26 to 28, a panel 80 provided between the intermediate pillar 50 and the corner pillar 60 has an L-shaped cross-section mating member 81 on the side end face 80a on the intermediate pillar 50 side. It is fixed by bolts 85 with members. The free end portion 81a of the mating member 81 is arranged facing the outside of the panel 80. This free end 81
“a” has a length that fits between the mating member 54 of the intermediate column 50 and the inner surface 53 of the intermediate column 50 (see FIG. 31).

The side end face 80b on the corner post 60 side also has
An alignment member 82 having an L-shaped cross section is fixed by a bolt 85 with an insert member. The mating member 82 having an L-shaped cross section has its free end 82 a facing the inside of the panel 80. This free end 82a
The mating portions 71 and 72 of the mating member 70 for corner pillars
, And a length that fits between the corner pillar 60 and the surface 63 (see FIG. 29). At the top of the panel 80,
A plurality of insert members IS having a bifurcated lower portion, into which the eyebolts IB for lifting the crane can be detachably embedded, are embedded.
Is screwed with an eyebolt IB. Panel 80
Is a plate member made of concrete in which lattice-shaped reinforcing bars 86 are arranged as aggregates. This panel 80 shows a panel 80 provided between the intermediate pillar 50 and the corner pillar 60. In addition to this panel 80, each of the intermediate pillars 50, 50
There is a case where a panel is provided between the panels. However, the panel is different only in that both mating members of the panel 80 are provided facing outward. Is omitted.

In the corner post 60, FIGS.
0, the mating portions 73 and 74 of the mating member 70
The panel is erected so that the side member 80b of the panel 80 slides between the mating member 82 and the mating members 72, 73 between the column surfaces 63, 63. 31 and 32, the side end 80a of the panel 80 slides between the mating member 84a and the mating member 82a between the mating portion 84a of the mating member 84 and the surface 53 of the column. Panel 80 is erected.

Between adjacent corner columns 60 and intermediate columns 50,
Then, the panel 80 is dropped between the adjacent intermediate pillars, and as shown in FIGS. 33 to 35, an underground structure surrounding the four sides with the panel is constructed. As this underground structure, three 2
It is a step up and down underground parking lot. (8) Bottom slab placement step 8 As shown in FIG.
Are flattened, compacted with a rammer and a damper, and an anchor bar is attached to an insert member attached to the built-in panel 80 to arrange a bottom plate portion. Using a chute S, the bottom slab concrete is cast into the slab portion of the bottom slab using a chute S, and the surface on which the bottom slab W (see FIG. 9) is cast is finished with a metal trowel. (9) Panel water stopping and mortar filling process 9 Gap between each panel 80 built and each column 60, 50,
In particular, the groove M is filled with a waterproofing agent such as a foamed rubber agent to stop the water. A formwork 90 such as plywood is installed in a space between the side end surfaces 80a and 80b of both panels adjacent to each other, and mortar is filled in this space (see FIGS. 29 and 31). (10) Tie-Beam Casting Process 10 As shown in FIG. 9, the base material of the tether is laid on each pillar and the upper part O of the four-sided wall, and the hanging eyebolts at the top of each pillar and each panel are provided. Replace it with a reinforced eyebolt, place the reinforced steel, install the tie beam formwork at the tie beam installation site,
Reinforcement is arranged inside, concrete is cast in the formwork, and the connecting beam 95 is installed (see FIG. 10).

When the underground structure is a three-stage or more two-stage up / down underground parking lot, a strut 96 connecting the upper portions of the intermediate columns is installed to prevent the columns from protruding inward due to earth pressure ( See FIG. 33). As shown in FIG. 36, the strut 96 is a member made of concrete using a reinforcing bar 96a having a square inside as an aggregate.

In FIGS. 33 to 35, the connecting beam 95 is formed by forming the panels 80, 80, 80, 80 and the upper portions of the columns 60, 50, 50, 60 having a fixed width in a square ring shape. It is installed and can prevent the wall from protruding inward due to earth pressure. The code AN is
4 shows an anchor bolt. (11) Guide inner frame removing step 11 In FIG. 10, after the concrete of the connecting beam 95 is solidified, the guide inner frame 11 </ b> B is attached to each of the panels 80, 80, 8.
0, 80 and removed from each pillar 60, 50, 50, 60,
A three-tier, two-tiered, liftable underground mechanical parking lot, that is, an underground structure is completed, and the underground structure construction method is completed.

In FIGS. 6, 7 and 9, reference numeral Z indicates a temporary member.

A three-tiered, two-tier, lift-type underground mechanical parking lot
As shown in FIGS. 33 to 35, each corner column, each intermediate column, and each panel constitute a wall, and the bottom plate W
And a connecting beam 95 is provided on the upper part of the wall. 33 and 35, reference numeral 100 indicates a drainage channel.

The above embodiment has been described by taking as an example an installation example for installing a three-stage, two-stage, liftable underground mechanical parking lot as an underground structure. Two stages,
Not a lifted underground mechanical parking lot, but 2 to 14 stations
It is needless to say that the present invention is also applied to a construction example in which a step and a lifting type underground mechanical parking lot are installed.

[Brief description of the drawings]

FIG. 1 is a process diagram of an underground structure construction method of the present invention.

FIG. 2 is an explanatory diagram illustrating a cloth digging step of FIG.

FIG. 3 is an explanatory view for explaining a pillar building and drilling step of FIG. 1;

FIG. 4 is an explanatory diagram illustrating a guide installation step of FIG. 1;

FIG. 5 is an explanatory diagram for explaining a pillar building / consolidating step of FIG. 1;

FIG. 6 is an explanatory view illustrating a guide outer frame removing step of FIG. 1;

FIG. 7 is an explanatory view illustrating a panel building / body excavating step of FIG. 1;

FIG. 8 is an explanatory diagram for explaining a bottom slab placing process of FIG. 1;

FIG. 9 is an explanatory view illustrating a connecting beam setting step of FIG. 1;

FIG. 10 is an explanatory view illustrating a guide inner frame removing step of FIG. 1;

FIG. 11 is a plan view of a guide employed in the method for constructing an underground structure according to the present invention.

FIG. 12 is a side view of a guide employed in the method of constructing an underground structure according to the present invention.

FIG. 13 is a partially enlarged plan view of a guide employed in the method of constructing an underground structure according to the present invention.

14 is a partial cross-sectional side view taken along line AA of FIG.

FIG. 15 is a perspective view of a corner portion of a guide used in the method of constructing an underground structure according to the present invention.

FIG. 16 is an intermediate perspective view of a guide employed in the method for constructing an underground structure according to the present invention.

FIG. 17 is a plan view showing an example of an intermediate column employed in the underground structure construction method of the present invention.

FIG. 18 is a front view showing an example of an intermediate column employed in the underground structure construction method of the present invention.

FIG. 19 is a perspective view showing an example of an intermediate column employed in the underground structure construction method of the present invention.

FIG. 20 is a sectional view taken along line DD of FIG. 19;

FIG. 21 is a plan view showing an example of a corner pillar used in the method of constructing an underground structure according to the present invention.

FIG. 22 is a front view showing an example of a corner post employed in the underground structure construction method of the present invention.

FIG. 23 is a right side view showing an example of a corner post employed in the underground structure construction method of the present invention.

FIG. 24 is a perspective view showing an example of a corner post employed in the method of constructing an underground structure according to the present invention.

FIG. 25 is a sectional view taken along line HH of FIG. 24;

FIG. 26 is a plan view showing an example of a panel employed in the underground structure construction method of the present invention.

FIG. 27 is a front view showing an example of a panel used in the method of constructing an underground structure according to the present invention.

FIG. 28 is a sectional view taken along line EE of FIG. 27;

FIG. 29 is a plan view showing a state where the panel is erected by the joining member in the corner post.

FIG. 30 is a vertical sectional front view taken along line FF of FIG. 29;

FIG. 31 is a plan view showing a state in which the panel is erected by the joining member in the intermediate pillar.

FIG. 32 is a front view showing a state where the panel is erected by the joining member in the intermediate pillar.

FIG. 33 is a plan view of an underground structure constructed by the underground structure construction method of the present invention.

FIG. 34 is a central longitudinal sectional view of an underground structure constructed by the underground structure construction method of the present invention.

FIG. 35 is a central cross-sectional view of an underground structure constructed by the underground structure construction method of the present invention.

FIG. 36 is a cross-sectional view of a strut employed in the method of constructing an underground structure according to the present invention.

[Description of Signs] 11A Outer frame 11B Inner frame 50 Intermediate pillar 60 Corner pillar 80 Panel 95 Connecting beam R Guide

Claims (4)

[Claims] A concrete pillar is vertically buried at each corner of a basement to be constructed and at a predetermined intermediate position between the corners, and a concrete panel is placed between adjacent pillars. In a method of constructing an underground structure surrounding four sides of a basement by excavating and removing a lower soil to a predetermined depth, a cloth moat for installing a position for installing the column and a guide for burying the column. The cloth digging process of digging the cloth digging above. Pillar construction for drilling the pillar deeper than the predetermined depth where the panel descends at the position where the cloth moat pillar is built
Drilling process. A guide installation step of assembling and installing a guide including a guide portion for burying the pillar, and including an outer frame and an inner frame. Pillar erection / consolidation step of erection of pillars in the cloth moat along the guides and casting concrete in the deeper parts to fix the pillars. Guide outer frame removal process for removing the outer frame of the guide. Excavating the lower part of the panel while hanging the panel between the columns, and dropping the panel. A connecting beam setting step of installing reinforcing connecting beams for preventing the above-mentioned walls from protruding inward due to earth pressure, on each pillar and above the four side walls. Guide inner frame removal process to remove the inner frame of the guide after the concrete of the connecting beam is solidified.
A method for constructing an underground structure, comprising: 2. Concrete pillars are vertically buried at each corner of the underground structure to be constructed and at predetermined intermediate positions between the corners, and a concrete panel is placed between adjacent pillars. In a method of constructing an underground structure surrounding four sides of a basement by excavating and removing a lower soil to a predetermined depth, a cloth moat for installing a position for installing the column and a guide for burying the column. The cloth digging process of digging the cloth digging above. Pillar construction for drilling the pillar deeper than the predetermined depth where the panel descends at the position where the cloth moat pillar is built
Drilling process. A guide installation step of assembling and installing a guide including a guide portion for burying the pillar, and including an outer frame and an inner frame. Pillar erection / consolidation step of erection of pillars in the cloth moat along the guides and casting concrete in the deeper parts to fix the pillars. Guide outer frame removal process for removing the outer frame of the guide. Excavating the lower part of the panel while hanging the panel between the columns, and dropping the panel. A bottom slab casting process in which a bottom slab is provided below a portion surrounded by a dropped wall. A connecting beam setting step of installing reinforcing connecting beams for preventing the above-mentioned walls from protruding inward due to earth pressure, on each pillar and above the four side walls. Guide inner frame removal process to remove the inner frame of the guide after the concrete of the connecting beam is solidified. A method for constructing an underground structure, comprising: 3. A concrete column is buried vertically at each corner of the underground structure to be constructed and at a predetermined intermediate position between the corners, and a concrete panel is inserted between adjacent columns. In a method of constructing an underground structure surrounding four sides of a basement by excavating and removing a lower soil to a predetermined depth, a cloth moat for installing a position for installing the column and a guide for burying the column. The cloth digging process of digging the cloth digging above. Pillar construction for drilling the pillar deeper than the predetermined depth where the panel descends at the position where the cloth moat pillar is built
Drilling process. A guide installation step of assembling and installing a guide including a guide portion for burying the pillar, and including an outer frame and an inner frame. Pillar erection / consolidation step of erection of pillars in the cloth moat along the guides and casting concrete in the deeper parts to fix the pillars. Guide outer frame removal process for removing the outer frame of the guide. Excavating the lower part of the panel while hanging the panel between the columns, and dropping the panel. Filling the space between the panel and the column with a waterproofing agent, installing a formwork inside the space between the side end surfaces of both panels adjacent to each other, and filling the mortar in this space. . A connecting beam setting step of installing reinforcing connecting beams for preventing the above-mentioned walls from protruding inward due to earth pressure, on each pillar and above the four side walls. Guide inner frame removal process to remove the inner frame of the guide after the concrete of the connecting beam is solidified. A method for constructing an underground structure, comprising: 4. An underground structure construction method according to claim 1, 2 or 3, wherein the underground structure is a method for installing a two-stage underground mechanical parking lot. Structure construction method.